david

as you converted everything in VW, would it possible to buy a Mac 
version?
My problem is that at home we are mac and in the school of my wife they 
have PC :(

Stef


On Mardi, sep 9, 2003, at 17:34 Europe/Zurich, David Buck wrote:

> For version 3.0 of ElastoLab, I converted all the physics code from 
> C++ to VisualWorks Smalltalk.  The only C libraries left are to 
> interface to DirectX 8 for playing sound and to interface to HTML help 
> (neither apply to the Squeak physics libraries I provided).
>
> The code I posted is complete pure Squeak Smalltalk which should run 
> anywhere Squeak runs.  No plugins are needed.  All code is Smalltalk 
> andeverything is visible, nothing hidden.  It includes an adaptive 4th 
> order Runge Kutta differential equation solver to do very stable 
> physics calculations.  The code for particles, springs, elastics, air 
> resistance, and gravity are all quite straightforward and have a 
> fairly nice simple Smalltalk interface.  If anyone wants to convert 
> this code to 3D, I think it would be quite trivial.
>
> The Advanced stuff is provided for people who want to push the 
> barriers (so to speak).  The code in this section are 2D specific. The 
> algorithms include dynamic constraints, and this algorithm for 
> computing contact forces for rigid bodies with static and dynamic 
> friction:
>
>   http://www.pixar.com/companyinfo/research/deb/sig94.pdf
>
> It seems to work, but it's heavy slogging to go through the code.  
> I've included it for completeness.  It's harder to interface to, but 
> still not too bad.  I fear that the performance may not be great on 
> this code, though.  It's ok with few particles and barriers in 
> VisualWorks.  I haven't done any testing on that part in Squeak.  
> Proceed with caution.
>
> David Buck
> Simberon Inc.
> www.simberon.com
>
>> Hi dvid
>>
>> this is a great news (at least for my wife who is a physic teacher).
>> how are you dealing with the C or C++ parts? did you port them into
>> Squeak? do we need a plugin? Is it running on mac/pc?
>>
>> Stef
>
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